The term "back muscles" refers to a group of muscles located in the back that are responsible for supporting and moving the body. These muscles include the erector spinae, latissimus dorsi, trapezius, rhomboids, and serratus anterior among others. They work together to provide stability, support, and flexibility to the spine while also allowing for various movements such as bending, twisting, and lifting. The back muscles play a crucial role in maintaining good posture and overall body balance.